Lathe stock feeder



Dec. 30, 1952 E. JOHNSON LATHE STOCK FEEDER Unvemoz ELMEIZ JOHNSON as M 42% attomzy 5 Sheets- Sheet 1 Filed Jan. 25, l

3 Sheets-Sheet 2 Dec. 30, 1952 E. JOHNSON LATHE STOCK FEEDER Filed Jan. 25, 1951 Dec. 30, 1952 E. JoHNsdN 2,623,268

LATHE STOCK FEEDER Filed Jan. 25, 1951 Sweets-Sheet 5 INVENTOQ ELMEQ JOHNSON Ewan-m,

ATTQQNCY Patented Dec. 30, 1952 UNITED STATES PATENT OFFICE?- LATHE STOCK FEEDER Elmer Johnson, Shelbyville, Ind. Application January 25, 1951, Serial No. 207,897

This invention relates to a device for feeding bar stock through a head in a turret lathe. The device may be operated in any number of different ways, one particular way being by a suitable lever convenient to the operator of the lathe, which lever he may rock back and forth in order to obtain the desired length of stock at the particular tool then set to operate upon the bar.

A primary object of the invention is to provide a device which will be positive in its feeding operation, and at the same time will not nick or mar the stock in any way whatsoever.

A further important object of the invention is to provide a device of the nature indicated which will be easily and quickly mounted on the ordinary support bar heretofore supplied to hold the bar stock, whereby the feeder head of the device may be quickly adjusted circumferentially in respect to that support bar, as well as vertically thereof so that the required alignment of the bar stock in conjunction with the usual collet is had.

These and many other objects and advantages of the invention will become apparent to those versed in the art in the following description of one particular form of the invention which I have found to be quite serviceable, as illustrated in the accompanying drawings, in which Fig. 1 is a view in side elevation of the device as mounted ready for operation, portions of the supporting and manipulating members being broken away to disclose interior parts thereof;

Fig. 2 is a, view in vertical section on the line 2--2 in Fig. 1;

Fig. 3 is a view in vertical section on the line 3-3 in Fig. 1;

Fig. 4 is a view in side elevation and vertical longitudinal section of the feeder head of the device;

Fig. 5 is a view in vertical transverse section on the line 5-5 in Fig. 4; I

Fig. 6 is a view in vertical transverse section on the line 6-43 in Fig. 4;

Fig. 7 is a view in bottom plan of the feeder head;

Fig. 8 is a view in transverse section on the line 8-8 in Fig. 3;

Fig. 9 is a view in front elevation of a clutch collar for rectangular stock;

Fig. 10 is a view in front elevation of a clutch collar for hexagonal stock; and

Fig. 11, a detail in side elevation and partial section of a lathe spindle collet actuating mechanism, on a reduced scale.

A tubular spindle shaft II is carried in longitudinally fixed position by the lathe (not shown) 16 Claims. (Cl. 29-151) to have on its outer end the lathe collet operating mechanism comprising the arms I3v and I4 carried by the collar I2 to rockably hold the operating arms I3 and I4 in the path of the arms spreader l5 floating on the spindle II. This spreader I5 is provided with an annular groove I6 therearound into which permanently enters the finger I! of a crosshead I8. The crosshead I8 is mounted to slide freely on the stock support bar I9. A lever 28 rockably connected to the underside of the crosshead l8 serves as means to shift the crosshead I8 along the bar I9, and consequently shift the spreader I5 along the shaft II. The spreader I5 may be carried quite a distance to the right of the arms I3 and I4 when the stock is being fed to the lathe to be gripped by the collet I0.

Referring to Fig. 11, the collet I0 operates'in the usual manner by having a tube 9 loosely fitting within the spindle I I to have a foot 8 on each arm I3 and I4 extend over the outer end, and to be in the path by its other end with the collet II] which enters by its tapered end into the wedge block 1 for contraction on the stock to be held, when the arms I3 and I4 are spread apart. -All of the elements illustrated in Fig. 11 revolve in unison from the lathe drive. I

So much of the structure thus far described is old in the art, and my invention is interconnected to operate therewith.

There is a feeder head generally designated by the numeral 2I, Figs. 1, 4 and 7. This head 2| has a tube 22 extendingfrom its rear end toserve as the head supporting member. The tube 22 is encircled by a split bracket 23, Figs. 1 and 2, which carries a pair of through bolts 24 and 25 each respectively stepped as at 26 and 21 into larger diameters outside and below the bracket 23 to be screw-threaded for a distance, and to extend downwardly through a cap 28 I and 'a base 29.

The cap 28 is rested on top of the bar I9 with the bolts 24 and 25 extending therethrough and carrying the bracket 23 thereabove. The nuts 30 and 3I are adjusted along the threads 32 and 33 to space the bracket 23 the proper distance above the shaft I9. The base 29 is applied to the underside of the shaft or bar I9 and the lower nuts 34 and 35 are carriedupwardly on the lower ends of the bolts 24 and 25 to cause the base 29 to bear against the bar I9 and pull the cap 28 downward- 1y thereon into clamping engagement so that the bracket 23 may thereby be adjusted circumferentially around the bar I9 as well as vertically thereabove. The bracket 23 is secured in position bearings '5 I by drawing the top nuts 36 and 3'! downwardly on the bolts 24 and 25, the nut causes the bracket 23 to be squeezed into clamping engagement around the tube 22. Thus the longitudinal axis of the tube 22 is brought into parallel alignment with the longitudinal axis of the bar 59.

There is telescoped within the tube 22 the inner tube 45 with a close sliding fit. On the outside of the tube 22 there is a third tube, this tube 4| being telescoped with the tube 22 with a close sliding fit. The outer tube 4| enlarges into a bell 42 at the front end of the tube.

On the front end of the tube 45, there is secured a collar 44 which serves in one capacity as a limiting stop for the withdrawal of the tube from the outer end of the tube 22. The collar 44 is secured to the end of the tube 4%) in any suitable manner, herein shown as having the tube end spun over the outer face of the collar 44.

In another capacity, the collar 44 serves as an abutment. for the inner race 45 which carries a series of ball bearings 46 'therearound and held against'th'e race 45 .by an outer race way 4?. The outer raceway '41 is held in contact with the balls 46 by means of a cupped portion 35 extend- 'ing as an integral part of the collar 44 around the outer peripheral portion of the race 45 and thetrace 'way 41 to be spun over the outer face of the raceway 41, Fig. 4.

The bell 42 extends outwardly to have an enlarged portion 49 within which is seated a race way 50' around which is carried a plurality of ball An inner raceway 52 is provided to have the ball bearings 5! between it and the outer raceway 55, Figs. 4 and 8. The annular bearing thus formed is secured in place by means of a split spring washer 53 which drops within a groove 54 in the mouth of the bell portion 45 to bear against the front face of the race 55. This spring washer 53 serves as a removable keeper. .A rocker carrier 55 is pivotally carried by the inner race 52 by means of the trunnion pins 55 and 51. These pins 55 and 5'! extend from the carrier 55 'in a common diametrical axial align ment.

The bearing raceway 52 is split into two parts 52a and 52b in order that the pins 55 and 5'! may be entered into the raceway 52 for a supporting bearing. In other words the bearing for the pins 56 and 51 is divided between the two parts 52a and 52b, then the two parts are brought together and held rigidly by the through rivets 58.

A block 60 is secured against the rear face of the raceway part 52b, Figs. 4 and 6, by one of these rivets 58 passing therethrough. This block 50 extends downwardly to be in the path of the carrier 55 so that the carrier 55 is limited in its ability to rock about the axis of its pins 56 and 5.1., by having the upper portion of the carrier 55 come into abutment therewith as indicated in Fig. '4.

The lower portion of the block carries a pin 6| horizontally slidable therethrough, to have the forward end free to come into contact with the upper portion of the carrier 55, and its rear end to be in the path of the raceway 4?.

The carrier 55 is provided with a well 62 and 53 around each of the pins 55 and 51, to receive therein torsion springs 64 and 55. End portions 66 and 51 respectively of these springs 64 and 65 are carried across the back face of the carrier 55 to bear thereon, and the other ends 58 and 69 of the springs are carried over onto the back face of the raceway 52 to be secured under the ends of a counterweight 10 by means of the rivets 58. This counterweight 10 is provided to balance the ro- 4 tative parts carried by the ball bearings 5i with the block 6!].

The carrier 55 is provided with a circular clutch plate 7|, shown in Figs. 4, 6, and 8, as having a circular opening therethrough. This plate 7| is secured within the carrier 55 by any suitable means, herein shown as by a set screw 12 enter radially through the carrier 55 to abut the peripheral portion of the plate ll, and also by a screw 13 entering the carrier 55 to have its head come into abutment with the front face of the plate H, to retain the plate in position and against the rear flange 14 carried around the carrier 55, to abut the rear face of the plate '0' I.

This plate 7% has been described as having a central circular opening therethrough. The circular opening is provided when round bar stock such as the bar ":5 is to be fed by the device. Where the stock is square in section a plate 75 as shown in Fig. 5 will be employed having a square opening therethrough, and should the stock take a hexagonal shape, then a flat ll as shown in Fig. 16 will be employed. This plate '5'! is .provided with the .six faces to correspond with the faces of the stock. in any event, these plates H, 75, and ill, will all have the same common diameter so as to interchange one with the other and be carried selectively by the carrier 55 as the demand may be in accordance with the shape of the stock. Of course any other sectional shape of stool: maybe fed by the device, in which case there will be a correspondingly shaped bore through the plate carried by the carrier.

The springs 5-4 and 55 are so wound and so tensioned that the carrier will normally be carried to have its upper portion in abutment with the block 55, as indicated in Fig. 4, but the carrier .55 may be rocked as indicated to the dash line position, or therebeyond as shown in Fig. 4, to carry the upper portion, of the carrier away from the block 65.

As will be noted in referring to Figs. 4, 8, 9, and 10, the plate H, it, and H, in the respective in stances, will have the marginal edges at both ends of the central bore 78 therethrough rounded as at '59 and 59, that is on both the front and rear sides. I find that the radius of the curvature at these marginal edges for a plate substantially three eighths of an inch in thickness is very satisfactory when the radius is approximately three thirty-seconds of an inch. In other words these marginal edges have a decided curvature contrary to what has been the usual practice which has been to these edges as sharp as possible, that is the bore surface is. at rightangles to the front and back faces of the plate.

The tube 4! is provided with a pair of laterally extending ears 82 and 83 near its rear end 84. Above these ears 82 and 85,'the tube 41 is cut through by an upper encircling slot 35.

Within this slot 85 there is carried a band of friction material 85 secured to the under side of a cap 8?, this material 85 and the cap 8'! serving in effect as a brake shoe. The cap 3! is provided with outturned cars 88 and 89. Cap screws 50 and 55 pass slidingly respectively through the ears 8% and 89 and screw-threadedly engage in the ears B2 and 83, Fig. 5. Surrounding the upper portions of the cap screws and Hi there is in each instance a compression spring 92 and 93 herein shown as bearing by their upper ends against a cup washer 94 and 95 respectively, with the lower ends of the springs 92 and 93 bearing against the top sides of the ears 88 and 89. Therefore in running down the cap screws 90 and SI, there is a yielding pressure set up against the ears 80 and 80 which pressure in turn is conveyed to the friction material 86 hearing against the tube 22 which appears across the slot 85. This arrangement is provided to set up a braking action resisting travel of the tube 4I relative to the tube 22 which, it will be remembered, is fixed in position to be supported from the bar IS. The degree of slippage of the tube M in reference to the tube 22 may be varied by the compression applied through the springs 92 and 93 depending upon the positioning of the cap screws 90 and BI The tube 4| is provided with a central longitudinally disposed slot 91 extending from a point 08 near the rear end 84 and continuing throughout the length of the tube M and on through the underside of the bell 42 to a point 09 adjacent the counterweight I0, Fig. 4. The tube 22 is provided with a downwardly extending lug I which fits by its sides with a sliding fit within the slot 97. This lug I00 is herein shown, Figs. 4 and '7, as being an integral part of the wall of the tube 22 and drawn downwardly therefrom.

This lug I00 is near the forward end of the tube 22, Fig. 4.

The collar 44 is counterbored as at IOI so that the tube 22 may be received relatively within that counterbore for a distance as indicated in Fig. 4. From the underside of the collar 44 there extends downwardly a foot I02 herein shown as rectangular in horizontal section. This foot I02 extends through the slot 0-1 so as to be free to slide therealone. In the form herein shown the foot I02 is a separate part from the collar 44 and is secured thereto by any suitable means, such as by the screw I03 passing upwardly through the foot I02 from its underside and screw-threadedly engaging in the collar 44. The foot I02 is provided with parallel, downwardly extending lips I04 and I05 herein shown as spaced apart the transverse width of the slot 91.

The feeder head 2I is operated by reciprocating the crosshead I8 on the support bar I9 by the interconnecting lever or link 20 which goes to the lathe. The feeder head 2| is interconnected with this crosshead I8 by means of a link bar I06,

Figs. 1 and 4. The upper side of the support bar I9 is provided with a slot I 0! which extends throughout its entire length, being disposed on its upper side. The cross head I 8 is normally provided with an upper slot I08 to leave a solid land I09 across the front end of that slot I08 as an integral part of the cross head III. The bar I06; is provided with a width which will permit it to slide freely by its under portion within the slot I 01. provided with a notch IIO of the length of the land I09 so that the front end portion of the link bar I06 may rest within the slot I01 by its underside, and receive the land I09 across through the slot IIII so that as the cross head I0 may be reciprocated longitudinally of the bar I9, the link bar I00 is given a likewise travel.

From the underside of the link bar I00, there is an entering slot III within which is fixed by one end a leaf spring I I2 to have a free end H0 turned downwardly to bear against the bottom of the slot I01 in the bar I9, so that the rear end portion of the link bar I06 is normally tended to be lifted upwardly out of the slot I0I as illustrated in Fig. l.

The rear end portion of the link bar I00 is provided with a notch II4 having a longitudinal length which will permit the bar IDE to come up The rear end of this link bar I 00 is into engagement with the underside of the foot I02 so that the ends of the notch IIII will form abutments on the front and back sides of the foot I02. The downturned lips I04 and I05 of the foot I02 will retain the link bar I06 against lateral displacement across the foot I02.

Immediately behind the notch I I4 there is secured to the top side of the link bar I06 (it may be an integral part thereof) a finger I I5, herein shown as being secured to the bar I06 by a screw IIO passing through the bar from its underside and screw-threadedly engaging in the finger I I5. This finger H5 has a cam surface III sloping upwardly from its back side to the upper end of the finger. The front side of the finger H5 is shown to be vertically disposed. This finger II5 enters the slot 91 by its upper end normally forward of the lug I00 as indicated in Fig. 4, when the link bar I06 is seated against the underside of the foot I02 with the notch I I4 engaging thereabout. The notch H4 has the front end abutment I I0 and the rear end abutment I I9 passing upwardly respectively on the front and back sides of the foot I 02, Fig. 4. The spacing apart of these abutments H0 and H9 is slightly greater than the length of the foot I02 so that the bar I05 may be readily dropped downwardly from the foot I02 against the compression of the spring H2 without the bar I06 tending to stick in engagement with the foot I02.

Operation Normally, the collar I2 and the feeder head 2| will be positioned at a greater distance apart than is indicated in the drawing, because in the drawings, these parts have been closely spaced in order to permit illustration of the parts as large as possible within the confines of the drawing sheets. That means that the link bar I 06 would be correspondingly lengthened. For example, in one particular installation, I have found that a length of bar I06 as between the front side of the finger H5 and the rear side of the land I09 on the cross head I08, of approxi mately eleven and one-quarter inches works very satisfactorily where the colletIB is designed to handle bar stock of from one inch in diameter and less.

To begin With, the stock bar I5 is inserted through the feeder head 2| to extend through the clutch plate II, Fig. 4, and then on through the eollet I0 (in open condition) and on through into the position at the lathe head for the cutting operations. The cross head I8 will be shifted to the left, to cause the operating surface I5 to spread apart the arms I3 and I4 to close the collet I0 and hold the stock bar I5 against longitudinal travel therethrough. The tubular shaft II will then be revolved in the usual and well known manner for the cutting operation.

Then for subsequent travel of the bar the device of my invention comes into play. The bar I5 is to be shifted to the right. Therefore the cross head I8 will be pulled to the right by the member 20 to release the collet I0 so that the bar I5 may be free to travel therethrough. As the cross head I0 is shifted to the right, the link bar I00 then in engagement with the foot I02 under the urging of the spring I I2 will pull the foot I02 to the right, to bring the raceway 41 up against the pin Iii to cause it to slide through 19011 the under rear side will respectively be brought into engagement with the bar 15. The bar will be firmly gripped by this cocked position of the plate ll without marring the bar 75 in any respect by reason of those rounded edges, but a firm engagement will be had even though the bar 75 will be greasy as it normally is. This engagement of the bar 15 will have taken place by the time the collet i is opened by the travel of the surface l out from under the fingers l3 and M sufficiently for that release.

The cross head 18 is then carried to the right along the support bar IQ for that distance which will cause the desired length of feed of the stock bar toward the lathe. In this travel is after the initial. engagement of the clutch plate i! with the bar it, the foot IE2 will then carry along with it the collar 44 causing the tube as to follow along inside of the tube 22, and through the push on the pin 6!, will carry the tube ll on the outside of the tube 22 also therealong against the frictional resistance set up by the material 8% bearing on the tube 22 and resisting travel of the tube 4!.

Thus, as long as there is forward pull on the foot 532, the plate a! will be maintained in its engagement with the bar stock l5 because the bell d2 carrying that plate ll will not tend'to shift forward under vibration or accidentally relative to the tube 22 or the tube 4% since it is frictionally held in position.

In this travel of these various members to the right, the tube ii travelling along over the tube 22 will then travel relative to the lug I06 engaged within the slot 91, until that lug loll is contacted by the rear end 98 of the slot which limits the travel of the feed to the right. Normally this contact between the lug E89 and the end 98 will not be had because the desired feed will be achieved beforehand, or if it is not, then the bar 1526 will be again shifted to the left and back again to the right for a subsequent feed travel.

In any event, assuming that the bar l5 has been fed to the desired right hand position, and the crosshead I3 is in its right hand position also, then the gripping of the bar 75 must be transferred from the plate ll to the collet iii. The crosshead i8 is started on its initial left hand travel, which will bring the collet control surface I? under the arms l3 and i l to close the collet 12. This means that the link bar we is also travelling to the left, but since the tube ill is frictionally secured in position relative to the tube 22, the plate it remains in its engaging position with the bar stock :5 for a slight initial travel of the foot 62 to the left, and until the collar it abuts the rear end of the bell 52 as at the surface I28, Fig. 4. This travel incidentally will be approximately that distance between the front face of the raceway H and the back face of the block st, or at least that amount of travel which was originally set up to carry the pin 6| into the plate I! engagement with the bar ?5. By the time the collar it has come into contact with the surface I28, the plate l'l has released the bar '55, and the bell G2 is then started to be shifted to the left against the frictional resistance of the material 86 on the tube 22. As this travel of the tube ll begins, the plate H is carried into its uncooked position allowing the springs 64 and 65 to return the carrier 55 to its normal upright position, so that the bar 75 is entirely released from control by the plate H 8 before the collet It] has closedinto holding engagement with the bar 15.

The operation thus described is that wherein there are but short lengths of feeding of the stock 15 to the left. Where there is a longer distance of feed to be required, the crosshead it will initially be far to the right, so as to carry the surface l5 at a distance away from the arms l3 and [4 to permit that feeding of the stock whereby there is sufficient room to bring the stock 15 along.

In this longer feeding, the operation will be as follows. The collet [0 will be open to permit free travel of the bar stock 15 therethrough, and the surface l5 will be removed a distance from the arms [3 and M. Then the crosshead I8 is carried to the left, but Without closing the collet lb, whereupon the crosshead I8 is then reversed to travel to the right to cause the plate H to initially be rocked into clutching engagement with the shaft 15 as above described. Then the bar I06 will be pulled to the right further to cause the tubes 4!) and 4! to travel to the right in sliding relation with the fixed tube 22 whereby the collar 44 is carried some distance to the right of the front end of the tube 22, until the desired length of feed of the bar 15 has been had.

Thereafter, the crosshead I8 is then returned in a left hand travel to bring the surface [5 into the collet closing position whereby the collet Ill engages the stock 15 to hold it in the cutting operation. However prior to that collet engagement with the bar 15, the link bar I06 has started its left hand travel also, leaving the tube ii in its extended position toward the collar l2 with the plate H in its locked position. The tube 4| is thus left stationary under continued travel of the link bar I06 and as the surface l5 approaches the collar I2 until the rear end of the collar 44 strikes the surface I20, after the plate H has been released as above described and the tube 4| also carried toward the left until the various parts reach the positions as indicated in Fig. 4.

Further travel of the link bar N36 to the left, will cause the cam surface ill of the finger H5 to strike the lug IE!) and cause the finger l [5 to travel downwardly to release the link bar from engagement with the foot H12 and thus prevent any damage to the parts by continued left hand travel of the crosshead [8 as may be required to complete the closing of the collet l0 or to take care of any over-travel of the crosshead IB, in the operating linkage, and control. The friction material 86 is provided to prevent movement of the tube 4! at anytime except when it is positively required such as is occasioned by travel of the link bar I06.

By reason of the fact that there is no ratchet engagement in any of the mechanism, and the entire control of the feeding of the bar 15 is under the control of travel of the tube 41, it is to be observed that a very flexible operation is to be obtained in respect to the desired or required feeding of the bar l5.

Therefore while I have described the invention in the one particular form, it is obvious that structural variations may be employed without departing from the spirit of the invention, and I therefore do not desire to be limited to that precise form beyond the limitations which may be imposed by the following claims.

I claim:

1. A bar stock feeder fora lathe having a re oiprocable operating member, and a stock support bar, comprising a tubular member; means supporting the tubular member from said support bar in a relatively fixed manner; an inner tube; an outer tube; both of said tubes telescoping with said tubular member; friction means between said outer tube and said tubular member resisting travel of the outer tube along the tubular member; a stock clutch plate; a plate carrier revolubly supported by said outer tube and rockable about an axis transversely of the axis of its revolving; said plate being mounted on said carrier, having a bore therethrough conformin in contour to that of said stock, anddimensioned to receive said stock loosely therethrough; a thrust bearing carried at the end of said inner tube; a carrier rocking pin supported to revolve with said carrier and be in the path of said bearing; said inner tube having a foot member projecting laterally therefrom; said outer tube having a longitudinal slot through which said foot member may extend; a link bar engaged by one end portion with said operating member and engaged by the other end portion with said foot member; and an abutment on said inner tube in the path of said outer tube; whereby travel of the link bar may shift said inner tube to shift to rock said carrier initially to cook said plate into engagement with said stock extending through said plate bore and then continue to shift the outer tube in the one direction, and travel of the link bar in the other direction will shift said inner tube away from said carrier and cause said abutment to strike said outer tube and thereby carry both tubes along said tubular member, releasing said plate from said engagement.

2. A bar stock feeder for a lathe having a reciprocable operating member, and a stock support bar, comprising a tubular member; means supporting the tubular member from said support bar in a relatively fixed manner; an inner tube; an outer tube; both of said tubes telescoping with said tubular member; friction means between said outer tube and said tubular member resisting travel of the outer tube along the tubular member; a stock clutch plate; a plate carrier revolubly supported by said outer tube and rockable about an axis transversely of the axis of its revolving; said plate being mounted on said carrier, having a bore therethrough conforming in contour to that of said stock, and di by travel of the link bar may shift said inner tube to shift to rock said carrier initially to cook said plate into engagement with said stock extending through said plate bore and then continue to shift the outer tube in the one direction, and travel of the link bar in the other direction will shift said inner tube away from said carrier and cause said abutment to strike said outer tube and thereby carry both tubes along said tubular member, releasin said plate from said ngagement; a bearing carried by said outer tube;

10 said carrier transverse axis being defined by diametrically disposed pins rockably carried by said outer tube bearing; and said clutch plate having rounded edges at each end of its bore to present said edges against said stock upon said cocking thereof.

3. A bar stock feeder for a lathe having a reciprocable operating member, and a stock support bar, comprising a tubular member; means supporting the tubular member from said support bar in a relatively fixed manner; an inner tube; an outer tube; both of said tubes telescoping with said tubular member; friction means between said outer tube and said tubular member resisting travel of the outer tube alon the tubular member; a stock clutch plate; a plate carrrier revolubly'supported by said outer tube and rockable about an axis transversely of the axis of its revolving; said plate being mounted on said carrier, having a bore therethrough conforming in contour to that of said stock, and dimensioned to receive said stock loosely therethrough; a thrust bearing carried at the end of said inner tube; a carrier rocking pin supported to revolve with said carrier and be in the path of said bearing ;v said inner tube having afoot member projecting laterally therefrom; said outer tube having a longitudinal slot through which said foot member may extend; a link bar engaged by one end portion with said operating member and engaged by the other end portion with said foot member; and an abutment on said innner tube in the path of said outer tube; whereby travel of the link bar may shift said inner tube to shift to rock said carrier initially to cook said plate into engagement with said stock extending through said plate bore and then continue to shift the outer tube in the one direction. and travel of the link bar in the other direction will shift said inner tube away from said carrier and cause said abutment to strike said outer tube and thereby carry both tubes along said tubular member, releasing said plate from said engagement; a lu on said tubular member presented in said slot on that side of said foot removed from approach thereto or" said link bar; a cam carried by said link bar in the path of said lug and having a surface upon contacting and travelling over the lu to shift said link bar from its said engagement with said foot member.

4. A bar stock feeder for a lathe having a reciprocable operating member, and a stock support bar, comprisinga tubular member; means supporting the tubular member from said support bar in a relatively fixed manner; an inner tube; an outer tube; both of said tubes telescoping with said tubular member; friction means between said outer tube and said tubular member resisting travel of the outer tube along the tubular member; a stock clutch plate; a plate carrier revolubly supported by said outer tube' and rockable about an axis transversely of the;

axis of its revolving; saidplate being mounted on said carrier, having a bore therethrough conforming in contour to that of said stock, and dimensioned to receive said stock loosely there-- through; a thrust bearing carried atthe end of said inner tube; a carrier rocking pin supported to revolve with said carrier and be in the path of said bearing; said inner tube having a foot member projecting laterally therefrom; said outer tube having a longitudinal slot through which said foot member may extend; a link bar engaged by one end portion with said operating member and engaged by the other end portion with said foot member; and an abutment on said inner tube in the path of said outer tube; whereby travel of the link bar may shift said inner tube to shift to rock said carrier initially to cock said plate into engagement with said stock extending through said plate bore and then continue to shift the outer tube in the one direction, and travel of the link bar in the other direction will shift said inner tube away from said carrier and cause said abutment to strike said outer tube and thereby carry both tubes along said tubular member, releasing said plate from said engagement; a lug on said tubular member presented in said slot on that side of said foot removed from approach thereto of said link bar; a cam carried by said link bar in the path of said lug and having a surface upon contacting and traveling over the lug to shift said link bar from its said engagement with said foot member; a spring interposed between said support bar and said link bar between its said two end portions normally urging the link bar other portion rockably laterally toward said foot member; and abutments on the link bar for push-pull engagement with said foot member.

5. In a bar stock feeder for a lathe, the combination with a stock support bar, a cross head reciprocable on the bar, of a fixed tube; bracket means interconnecting said support bar and said tub-e to hold the tube in substantially parallel,

spaced alignment with and above said bar; a

second tube slidingly telescoping inside said fixed tube; an end thrust bearing carried on the front of the second tube; a third tube slidingly telescoping outside said fixed tube; a radial bearing carried at the front of the third tube; an annular carrier supported by trunnions to revolve with said radial bearing and to rock transversely of the axis of said third tube; a clutch plate mounted on said carrier; said plate having a central, axial bore therethrough corresponding by the bore face in shape to that of said bar stock; said plate having rounded corners at the junctures of the bore face and the front and back faces of. the plate; a pin block carried, by said radial bearing on its back side to extend by a portion into the path of said carrier; a push pin carried by said block to be slidable thereinin longitudinaldirections in the path of said thrust bearing; saidthird tube being longitudinall slotted throughout a major portion of its length; a foot, carried by said second tube ahead of the fixed tube and ex-..

tending through the slot of the thirdtube, the foot being behind said thrust bearing; and a link bar having a pair of abutments on its rear end portion spaced to receive said foot therebetween; said link bar having a forward end portion to engage with said cross head.

6. In a bar stock feeder for a lathe, the combination with a stock support bar, a cross head reciprocable on the bar, of a fixed tube; bracket means interconnecting said supp rt bar andsaid tube to hold the tube in substantially parallel,

spaced alignment withand-above said bar; asec-h ond tube slidingly telescoping inside said fixed,

tube; an end thrustbearing carried onthe front of the second tube; a third tube slidingly telescoping outside said fixed tube; a radial bearing carried at the front of the third tube; an annular carrier supported by trunnions to revolve with said radial bearing and to rock transversely of the axis of said third tube; alclutch plate mounted on said carrier; said plate having a central, axial bore therethrough corresponding, by the bore face in shape to that ofsaidbar. stock;

said plate having rounded corners at the lune;- tures of the bore face and the front and back. faces of the plate; a pin block carried by said, radial bearing on its back side to extend by a portion into the path of said carrier; a push pin carried by said block to be slidable therein in longitudinal directions in the path of said thrust bearing; said third tube being longitudinally slotted throughout a major portion of its length; afoot carried by said second tube ahead of the fixed tube and extending through the slot of the third tube, the foot being behind said thrust bearing; a link bar having a pair of abutments on its rear end portion spaced to receive said foot therebetween; said link bar having a forward end portion to engage with said cross head; and friction means interposed between said fixed and third tubes yieldingly resisting relativetrayel therebetween.

7. In a bar stock feeder for a lathe, the combination with a stock support bar, a cross head reciprocable on the bar, of a fixed tube; bracket means interconnecting said support bar and said tube to hold the tube in substantially parallel, spaced alignment with and above said bar; a second tube slidingly telescoping inside said fixed tube; an end thrust bearing carried on the front of the second tube; a third tube slidingly telescoping outside said fixed tube; a radial bearing carried at the front of the third tube; an annular carrier supported by trunnions to revolve with said radial bearing and to rock transversely of the axis of said third tube; a clutch plate mounted on said carrier; said plate having a central, axial bore therethrough corresponding by the bore face in shape to that of said bar stock; said plate having rounded corners at the junctures of the bore face and the front and back faces of the plate; a pin block carried by said radial bearing on its back side to extend by a.

its rear end portion spaced to receive, said foot therebetween; said link bar having a forward end portion to engage with said cross head; and

friction means interposed between said fixed'and, third tubes yieldingly resisting relative; travel therebetween; and spring means normallyrock ing said carrier into abutment with said pin block.

8. In a bar stock feeder for a lathe, thecombination with a stock support bar, a cross head reciprocable on the bar, of a fixed tube; bracket means interconnecting saidsupport bar and said tube to hold the tube in substantially parallel,.

spaced alignment with and above said bar; a secondltube slidingly telescoping inside said fixed tube; an end thrust bearingcarried on the front of the second tube; a third tube slidinglyv telescoping outside said fixed tube; a radial bearing carried at the front of the third tube; aniannular carrier supported by trunnions to revolve with said radial bearing and to rock transversely of the axis of said third tube; a clutch plate mounted on said carrier; said plate having a central, axial bore therethrough corresponding by the bore face in shape to that of said' barstock; saidplate having rounded corners at the j uncturesofthe bore face and the front and back faces of the plate; a pin block carried by said radial bearing on its back side to extend by a portion into the path of said carrier; a push pin carried by said block to be slidable therein in longitudinal directions in the path of said thrust bearing; said third tube being longitudinally slotted throughout a major portion of its length; a foot carried by said second tube ahead of the fixed tube and extending through the slot of the third tube, the foot being behind said thrust bearing; a link bar having a pair of abutments on its rear end portion spaced to receive said foot therebetween; said link bar having a forward end portion to engage with said cross head; and friction means interposed between said fixed and third tubes yieldingly resisting relative travel therebetween; a spring carried by said link bar to bear upon said support bar to urge said abutments upwardly toward said foot; a cam carried by said link bar back of said abutments; and a cam lug carried by said fixed tube and extending into said slot into the path of said cam; said cam having an upper, upwardly and forwardly sloping face for lug engagement to push the link bar downwardly upon travel of the cam to release said abutments from engagement with said foot.

9. In a bar stock feeder for a lathe, the combination with a stock support bar, a cross head reciprocable on the bar, of a fixed tube; bracket means interconnecting said support bar and said tube to hold the tube in substantially parallel, spaced alignment with and above said bar; a second tube slidingly telescoping inside said fixed tube; an end thrust bearing carried on the front of the second tube; a third tube slidingly telescoping outside said fixed tube; a radial bearing carried at the front of the third tube; an annular carrier supported by trunnions to revolve with said radial bearing and to rock transversely of the axis of said third tube; a clutch plate mounted on said carrier; said plate having a central, axial bore therethrough corresponding by the bore face in shape to that of said bar stock; said plate having rounded corners at the junctures of the bore face and the front and back faces of the plate; a pin block carried by said radial bearing on its back side to extend by a portion into the path of said carrier; a push pin carried by said block to be slidable therein in longitudinal directions in the path of said thrust bearing; said third tube being longitudinally slotted throughout a major portion of its length; a foot carried by said second tube ahead of the fixed tube and extending through the slot of the third tube, the foot being behind said thrust bearing; a link bar having a pair of abutments on its rear end portion spaced to receive said foot therebetween; said link bar having a forward end portion to engage with said cross head; and friction means interposed between said fixed and third tubes yieldingly resisting relative travel therebetween; said third tube having a transverse slot thereacross; and said friction means comprising a brake shoe entering said slot to bear on said fixed tube; and means carried by the third tube yieldingly maintaining the shoe on said fixed tube.

10. A bar stock feeder comprising a relatively fixed tube; a second tube telescoping within the fixed tube; a third tube telescoping outside the fixed tube; a stock clutch plate a carrier therefor pivotally mounted in said third tube to be rockable on a diametrical axis of the tube; means for longitudinally shifting said second tube relaall) tive to said fixed tube; means between said second tube and said carrier at one side thereof to cause,

travel of said second tube to rock said carrier and plate; and yielding friction means holding said third tube against travel while said carrier and plate are being rocked.

11. A bar stock feeder comprising a relatively fixed tube; a second tube telescoping within the fixed tube; a third tube telescoping outside the fixed tube; a stock clutch plate a carrier therefor pivotally mounted in said third tube to be rockable on a diametrical axis of the tube; means for longitudinally shifting said second tube relative to said fixed tube; means between said second tube and said carrier at one side thereof to cause travel of said second tube to rock said carrier and plate; yielding friction means holding said third tube against travel while said carrier and plate are being rocked; said friction means yielding to permit travel of the third tube along with the second tube upon continued travel thereof; and an abutment carried by said second tube to be in the path of said third tube, to permit the second tube to carry back the third tube upon reverse travel of said shifting means.

12. A bar stock feeder comprising a relatively fixed tube; a second tube telescoping within the fixed tube; a third tube telescopin outside the fixed tube; a stock clutch plate a carrier therefor pivotally mounted in said third tube to be rockable on a diametrical axis of the tube; means for longitudinally shifting said second tube relative to said fixed tube; means between said second tube and said carrier at one side thereof to cause travel of said second tube to rock said carrier and plate; yielding friction means holding said third tube against travel while said carrier and plate are being rocked; said friction means yielding to permit travel of the third tube along with the second tube upon continued travel thereof; and an abutment carried by said second tube to be in the path of said third tube, to permit the second tube to carry back the third tube upon reverse travel of said shifting means; said third tube having a longitudinal slot extending through a major length thereof; said shifting means in-- cluding a foot carried by said second tube extending through said slot, said foot serving to hold the second and third tubes against relative rotation one with the other; and said fixed tube having a lug entering said slot holding the second and third tubes against rotation relatively to said fixed tube.

13. A bar stock feeder comprising a relatively fixed tube; a second tube telescoping within the fixed tube; a third tube telescoping outside the fixed tube; a stock clutch plate a carrier therefor pivotally mounted in said third tube to be rockable on a diametrical axis of the tube; means for longitudinally shifting said second tube relative to said fixed tube; means between said second tube and said carrier at one side thereof to cause travel of said second tube to rock said carrier and plate; yielding friction means holding said third tube against travel while said carrier and plate are being rocked; said friction means yielding to permit travel of the third tube along with the second tube upon continued travel thereof; and an abutment carried by said second tube to be in the path of said third tube, to permit the second tube to carry back the third tube upon reverse travel of said shifting means; said third tube having a longitudinal slot extending through a major length thereof; said shifting means including a foot carried by said second tube extending through said slot, said foot serving to hold the second and third tubes against relative rotation one with the other; and said fixed tube having a lug entering said slot holding the second and third tubes against rotation relatively to said fixed tube; said shifting means also including a link bar rockable toward and away from said foot; said link bar having thereon means to engage said foot to reciprocate it relative to said slot; and a cam member carried by said link bar in the path of said lug to kick said link bar out of said foot engagement upon a predetermined amount of said reverse travel.

' 1-4. In a bar stock feeder for a lathe, a stock engaging clutch comprising a tubular member fixed against rotation around its longitudinal axis; a radial bearing carried by said member fixed as to travel on said axis; a clutch plate having a bore to receive loosely said bar stock therethroug-h; said bore havin an inner wall shaped to conform to the shape of said stock; said wall merging at each bore end into the front and back faces of the plate through a rounding surface; a carrier supporting said plate; means rockably mounting said carrier on said bearing to have the carrier normally free to rock on an axis normal to and intersecting said member axis; said carrier axis being fixed in respect to movement along said member axis; and an abutment carried by said bearing against which said carrier may rest in its position at approximately right angles to said member axis.

15. In a bar stock feeder for a lathe, a stock engaging clutch comprising a tubular member fixed against rotation around its longitudinal axis; a radial bearing carried by said member fixed as to travel on said axis; a clutch plate having a bore to receive loosely said bar stock therethrough; said bore having an inner wall shaped to conform tothe shape of said stock; said wall merging at each bore end into the front and back faces of the plate through a rounding surface; a carrier supporting said plate; means rockably mounting said carrier on said bearing to have the carrier normally free to rock on an axis normal to and intersecting said member axis;

said carrier axis being fixed in respect to movement along said member axis; and an abutment carried by said bearing against which said carrier may rest in its position at approximately right angles to said member axis; spring means yieldingly retaining said carrier against said axis; and a carrier push pin supported by said abutment to be in the path of said carrier.

16. In a bar stock feeder for a lathe, a stock engaging clutch comprising a tubular member fixed against rotation around its longitudinal axis; a radial bearing carried by said member fixed as to travel on said axis; a clutch plate having a bore to receive loosely said bar stock therethrough; said bore having an inner wall shaped to conform to the shape of said stock; said wall merging at each bore end into the front and back faces of the plate through a roundingsurfaee; a carrier supporting said plate; means rockably mounting said carrier on said bearing to have the carrier normally free to rock on an,

abutment to be in the path of said carrier; a shiftable member within said tubular member having a bearing surface in the path of said pin; and means for moving the shiftable member to bear by said surface against said pin to effectrocking of said carrier from said abutment.

ELMER JOHNSON.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,504,930 Blanchard Aug. 12, 1924 2,169,107 Martin Aug. 8, 1939 2,216,872 Baxendale Oct. 8, 1940 

